Taking mathematics from the beginning of the world to the time when Newton lived, what he had done was much the better half.

I am so in favor of the actual infinite that instead of admitting that Nature abhors it, as is commonly said, I hold that Nature makes frequent use of it everywhere, in order to show more effectively the perfections of its Author.

To love is to place happiness in the heart of another.

It has long seemed ridiculous to me to suppose that the nature of things has been so poor and stingy that it provided souls only to such a trifling mass of bodies on our globe, like human bodies, when it could have given them to all, without interfering with its other ends.

I also readily admit that there are animals, taken in the ordinary sense, that are incomparably larger than those we know of, and I have sometimes said in jest that there might be a system like ours which is the pocketwatch of some enormous giant.

But in simple substances the influence of one monad over another is ideal only.

The words 'Here you can find perfect peace' can be written only over the gates of a cemetery.